Study on the catch, bycatch and discard of Chinese pelagic longline fisheries in the Atlantic Ocean

Pan, Boyi; Zhu, Jiangfeng; Lin, Qinqin; Geng, Zhe; Wu, Feng; Zhang, Yuying

doi:10.1016/j.aaf.2022.03.002

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…Loggerhead CPUE ranged from 0.2 to 1.0 between Mauritania and Sierra Leone, and olive ridley bycatch was highest at tropical areas southwards of The Gambia, where CPUE values ranged mostly from 0.2 to 14 turtles. Pan et al (2022) analysed the bycatch data of the Chinese national scientific observer programme from 2010 to 2018. The bluefin tuna longline fishery did not produce sea turtle bycatch; however, 82 turtles from three different species were caught in the bigeye tuna longline fishery.…”

Section: Resultsmentioning

confidence: 99%

“…bycatch compared with the rest of the Atlantic, with CPUE values between 0.4 and 14 leatherbacks. Loggerhead CPUE ranged from 0.2 to 1.0 between Mauritania and Sierra Leone, and olive ridley bycatch was highest at tropical areas southwards of The Gambia, where CPUE values ranged mostly from 0.2 to 14 turtles Pan et al (2022). analysed the bycatch data of the Chinese national scientific observer programme from 2010 to 2018.…”

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confidence: 99%

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Nowhere to hide: Sea turtle bycatch in Northwest Africa

de la Hoz Schilling,

Diame,

Hernández Ríos

et al. 2023

Aquatic Conservation

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Fisheries bycatch is considered the largest threat to sea turtle populations globally. However, it has been challenging to assess the impact of bycatch on sea turtles in some regions such as Northwest Africa (i.e. Cabo Verde, Guinea, Guinea–Bissau, Mauritania, Senegal, Sierra Leone and The Gambia) owing to large data gaps. This hampers effective management actions and interferes with conservation efforts in the region. Five sea turtle species occur in Northwest Africa (i.e. green turtle Chelonia mydas, hawksbill Eretmochelys imbricata, leatherback Dermochelys coriacea, loggerhead Caretta caretta and olive ridley Lepidochelys olivacea). The region has regionally and globally important sea turtle nesting and foraging habitats and is a global fishing hotspot, with high and increasing fishing pressure. Available information on sea turtle bycatch in Northwest Africa was compiled from peer‐reviewed and grey literature from 2010 onwards to determine the impact of artisanal and industrial fisheries (by gear type) on regional sea turtle populations and assess the level of threat to individual species. All sea turtle species occurring in the region are impacted by bycatch. Reports suggest that green turtles and loggerheads have the highest bycatch rates, probably owing to their regional abundance and widespread distribution. Some of the potentially highest reported global bycatch rates (14,000–90,000 turtles/year/country) are noted, particularly in gillnets, longlines and handlines. However, further research is needed to understand mortality levels from artisanal fisheries and assess the impact of trawl fisheries operating in the region. Additional sources of mortality include deliberate capture for consumption or trade. To strengthen regional sea turtle conservation and reduce sea turtle bycatch and mortality, urgent action is needed to implement and enforce national protection, establish a bycatch reduction framework (including gear modifications and spatio‐temporal closures), improve fisheries data collection and build capacity.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Nowhere to hide: Sea turtle bycatch in Northwest Africa

de la Hoz Schilling,

Diame,

Hernández Ríos

et al. 2023

Aquatic Conservation

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“…For example, once in the ocean, the bycatch is one of the biggest anthropogenic threats to turtles and other marine animals [8] [25] [26] [27] and measures such as turtle excluder devices (TEDs), and circular hooks in longline fisheries [1] must come into force. In particularly, there has been an expressive input of individuals due to Cape Verdean Conservation projects that attempt to mitigate the threats through the implementation of regional actions.…”

Section: What Is Missing?mentioning

confidence: 99%

The Poorly Known Northeast Atlantic Regional Management Unit for Loggerhead (<i>Caretta caretta</i>)

Ferreira¹,

Sales²,

Pereira³

et al. 2022

OJE

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Loggerheads are distributed by ten Regional Management Units (RMUs) worldwide. The Atlantic Ocean houses three of these: the Northwest, Southwest and Northeast RMUs. The most studied is, so far, the Northwest RMU, but the other two have focused attention of researchers. In contrast, marine turtles from the African Atlantic region (Southeast) belong to a complex but little-known region. What is their role in the Atlantic? Are these RMUs connected? To understand these questions, research was made of reports and publications concerning the Northeast Atlantic (NEA) RMU. The asymmetry in information and available knowledge about NEA is high when compared to other RMUs. This demonstrates that there is still a lack of conservation programs besides Cape Verde, and that there is difficulty in transforming data (nesting ecology, molecular, telemetry, etc.) into publications. However, this issue is evident for other marine turtle species of East African Atlantic. There is a need for better scientific support, to enable local conservation programs to deliver data in reports, and even scientific publications. There are so many aspects of loggerhead's life cycle that will only be unravelled by more and better supported studies. This is a paper that, by analysing the available information of the NEA loggerhead RMU, reflects the following steps to address in loggerhead conservation for the African Atlantic coast.

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“…In addition to feeding on poorly sampled taxa, Al. ferox is a useful sampler of deep-sea ecosystems because it is an abundant bycatch species on pelagic deep-set longlines 16 , 22 , and can be more readily collected than other deep-sea predators through partnerships with fishers and fisheries monitoring programs. Stomach content analysis of Al.…”

Section: Introductionmentioning

confidence: 99%

Harnessing a mesopelagic predator as a biological sampler reveals taxonomic and vertical resource partitioning among three poorly known deep-sea fishes

Portner,

Mowatt-Larssen,

Carretero

et al. 2023

Sci Rep

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Pelagic predators are effective biological samplers of midtrophic taxa and are especially useful in deep-sea habitats where relatively mobile taxa frequently avoid observation with conventional methods. We examined specimens sampled from the stomachs of longnose lancetfish, Alepisaurus ferox, to describe the diets and foraging behaviors of three common, but poorly known deep-sea fishes: the hammerjaw (Omosudis lowii, n = 79, 0.3–92 g), juvenile common fangtooth (Anoplogaster cornuta, n = 91, 0.6–22 g), and juvenile Al. ferox (n = 138, 0.3–744 g). Diet overlap among the three species was high, with five shared prey families accounting for 63 ± 11% of the total prey mass per species. However, distinct differences in foraging strategies and prey sizes were evident. Resource partitioning was greatest between An. cornuta that specialized on small (mean = 0.13 ± 0.11 g), shallow-living hyperiid amphipods and O. lowii that specialized on large (mean = 0.97 ± 0.45 g), deep-dwelling hatchetfishes. Juvenile Al. ferox foraged on a high diversity of prey from both shallow and deep habitats. We describe the foraging ecologies of three midtrophic fish competitors and demonstrate the potential for biological samplers to improve our understanding of deep-sea food webs.

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Study on the catch, bycatch and discard of Chinese pelagic longline fisheries in the Atlantic Ocean

Cited by 6 publications

References 14 publications

Nowhere to hide: Sea turtle bycatch in Northwest Africa

Nowhere to hide: Sea turtle bycatch in Northwest Africa

The Poorly Known Northeast Atlantic Regional Management Unit for Loggerhead (<i>Caretta caretta</i>)

Harnessing a mesopelagic predator as a biological sampler reveals taxonomic and vertical resource partitioning among three poorly known deep-sea fishes

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Study on the catch, bycatch and discard of Chinese pelagic longline fisheries in the Atlantic Ocean

Cited by 6 publications

References 14 publications

Nowhere to hide: Sea turtle bycatch in Northwest Africa

Nowhere to hide: Sea turtle bycatch in Northwest Africa

The Poorly Known Northeast Atlantic Regional Management Unit for Loggerhead (&lt;i&gt;Caretta caretta&lt;/i&gt;)

Harnessing a mesopelagic predator as a biological sampler reveals taxonomic and vertical resource partitioning among three poorly known deep-sea fishes

Contact Info

Product

Resources

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The Poorly Known Northeast Atlantic Regional Management Unit for Loggerhead (<i>Caretta caretta</i>)